A Variable Notional Equity Swap Differs from a Fixed Notional

A variable notional equity swap differs from a fixed notional equity swap in that

A) The variable notional swap involves a principal that,like an amortizing swap,decreases from period to period in a predetermined manner.
B) The variable notional swap involves a principal that changes from period to period depending on realized returns on the underlying equity or equity index.
C) The variable notional swap involves a principal that changes from period to period depending on realized Libor rates during the receding period.
D) In a variable notional swap,the receiver of equity returns can choose whether to pay Libor or the returns on a specified broad market index on each payment date.